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[containers] Where are cont-key-type/cont-mapped-type used? LWG3781 #5798

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hewillk opened this issue Aug 29, 2022 · 2 comments · Fixed by #5983
Open

[containers] Where are cont-key-type/cont-mapped-type used? LWG3781 #5798

hewillk opened this issue Aug 29, 2022 · 2 comments · Fixed by #5983

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@hewillk
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hewillk commented Aug 29, 2022 •
edited

P0429R9 introduced the following using aliases in [container.adaptors.general]:

The following exposition-only alias templates may appear in deduction guides for container adaptors:

template<class Container>
  using cont-key-type =                                // exposition only
    remove_const_t<typename Container::value_type::first_type>;
template<class Container>
  using cont-mapped-type =                             // exposition only
    typename Container::value_type::second_type;

But I didn't find these two being used anywhere. Any information or am I missing something?
@frederick-vs-ja
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They were used in P0429R8 but are meaningless now...

@jensmaurer jensmaurer mentioned this issue Jan 10, 2023
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LWG3781

@jensmaurer jensmaurer changed the title [containers] Where are cont-key-type/cont-mapped-type used? [containers] Where are cont-key-type/cont-mapped-type used? LWG3781 Jan 10, 2023
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[Motions 2022 11 lwg 7] P2703R0 C++ Standard Library Ready Issues cplusplus/draft
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@frederick-vs-ja @jensmaurer @hewillk